
here's an example:

convert \
    -size 165x70 \
    xc:lightblue \
    -font Bookman-DemiItalic \
    -pointsize 12 \
    -fill blue \
    -gravity center \
    -draw "text 0,0 'It is 28 degrees today'" \
    image.png

so, to, e.g. it for something closer to needs:

convert \
#?    -size 165x70 \
    xc:black \
    -font bf \
    -pointsize 4 \
    -fill white \
    -gravity center \
    -draw "
__          __             __
\ \_________\ \____________\ \___
 \  _ \  _\ _  \  _\ __ \ __\   /
  \___/\__/\__/ \_\ \___/\__/\_\_\
                      Bedrock Linux
" \
    image.png